Images of British Lichens
Lecanora caesiosora Poelt
Thallus whitish to pale grey, areolate, with areole surfaces brown-flecked to uniformly dark brown-granular, surface sorediate, soralia white or cream, sometimes plae greenish or blue, initially rounded and delimited, later extensive over the thallus surface, apothecia rare; on well-lit faces of siliceous rocks, northern, locally common.
Refs: Smith et al. (2009), 478; Purvis et al. (1992), 300; Dobson (2005), 215-216 (photo); Dobson (2011), 220-1 (photo, poorly printed); Wirth, Hauck & Schulz (2013), 1: 580, 581 (photo); .
|On basalt rocks, Traprain Law, East Lothian, June 2011, variant with blue soralia (shown to me by Brian Coppins)|
|On upland siliceous rocks, Braemar, Aberdeenshire, April 2003|
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Uploaded March 2008, last updated September 2013